How is redundancy achieved among Cisco vBond Orchestrators in a Cisco SD-WAN deployment?

How is redundancy achieved among Cisco vBond Orchestrators in a Cisco SD-WAN deployment?

A. The IP addresses of all Orchestrators are mapped to a single DNS name. B. The closest Orchestrator to each Cisco WAN Edge router is selected. C. Cisco WAN Edge routers are configured with all Orchestrators using their IP addresses and priority. D. A single Cisco Orchestrator is deployed in each network.